The non-operation of two auxiliary engines stranded the vessel. Considering the urgency of the situation, RA Power Solutions deputed two technicians along with a specially designed onsite crankshaft grinding machine capable of grinding crankpins with small diameters and narrow widths.

In the case of the MAK 6M20 auxiliary engine, the standard diameter of the crankpin is only 152.00 mm, with a bearing width of 71 mm. The design of our onsite crankshaft grinding machine is such that it can be mounted on the crankpin diameter through the inspection window, and grinding is executed in situ.

The details of the engine are as follows:

Upon arrival on board the vessel, our technicians conducted an initial inspection of all crankpins. They found excessive ovality in all six crankpins of the MAK 6M20 engine.

We have provided a copy of the preliminary dimensional inspection report below.

All other parameters, including hardness, MPI, and deflection, were within acceptable limits. We jointly decided to grind all the crankpins, and RA Power Solutions machined them to a final size of 151.00 mm (1.00 mm undersize) as per the above dimensions.

During the stay of our technicians on board the vessel, the crankshaft of Auxiliary Engine #02 was also inspected. We detected excessive ovality showing the same pattern observed in the crankshaft of Auxiliary Engine 01.

The preliminary dimensional inspection report is provided below:

SIZE OF CR Pins Before Grinding of A/E 02
	A	Aa	C	Cc	B	Bb	Min	STD	Ovality
CR-1	151.73	151.85	151.74	151.84	151.75	151.82	151.73	152.00	0.27 MM
CR-2	151.73	151.85	151.72	151.83	151.70	151.81	151.7	152.00	0.30 MM
CR-3	151.72	151.85	151.71	151.84	151.69	151.83	151.69	152.00	0.31 MM
CR-4	151.75	151.85	151.72	151.84	151.73	151.86	151.72	152.00	0.28 MM
CR-5	151.73	151.84	151.69	151.82	151.70	151.84	151.69	152.00	0.31 MM
CR-6	151.73	151.92	151.72	151.89	151.75	151.84	151.72	152.00	0.28 MM

Our technicians ground this crankshaft and maintained the following dimensions. They successfully commissioned both engines in their presence.

SIZE OF CR Pins After Grinding A/E 02
	A	Aa	C	Cc	B	Bb	Min	Max	Ovality
CR-1	151.00	150.99	150.99	150.98	150.99	151	150.98	151.00	0.02 MM
CR-2	151.00	150.99	150.99	150.98	151.00	150.98	150.98	151.00 0.02 MM	0.02 MM
CR-3	151.00	150.99	150.98	150.98	150.99	151.00	150.98	151.00	0.02 MM
CR-4	151.00	150.99	150.98	150.99	150.99	151.00	150.98	151.00	0.02 MM
CR-5	151.00	150.99	150.98	150.98	150.99	151.00	150.98	151.00	0.02 MM
CR-6	151.00	150.99	150.98	150.98	150.99	151.00	150.98	151.00	0.02 MM

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Crack Detection Test of Wartsila VASA Engine Model 12V32LN By MPI	Hardness Test of Wartsila VASA Engine Model 12V32LN

Main observations of the crankshaft of Wartsila Vasa are :

(I) On a visual inspection of crankpin number one, having a standard diameter of 270 mm, it was found to be damaged with deep line marks, pitting, and a rough surface.

(II) The crankpin was subjected to dimensional inspection after cleaning the embedded bearing material. The following measurements were observed for Crankpin Number One:

Minimum Diameter: 269.45 mm

Maximum Diameter: 269.89 mm

Ovality Observed: 0.55 mm

(III) All other crankpins were visually inspected, and no damage or marks were observed.

(IV) As per standard procedure, Crankpin Number One was subjected to a crack detection test using the MPI process, and hardness testing was also carried out. No abnormalities were observed

(V) Crankpin Number One was undersized by on site crankshaft grinding equipment. The diameter was reduced by 1 mm to control ovality and to remove the line marks observed after the bearing seizure. The final crankpin diameter was maintained as 269.00 – 0.02 mm.

Assembly of Crankshaft Grinding Machine on Damaged Crankpin	Onsite Grinding Under Process

RA Power Solutions, during its long-standing presence in the industry, has executed repair of over 1300 Wartsila engine crankshafts of various models. The most popular models serviced include WARTSILA 12V32 and WARTSILA 18V32, widely installed in diesel power plants around the world.

At RA Power Solutions, we specialize in on site crankshaft grinding for Wartsila, Yanmar, MAN, and MAK engines, offering a reliable and cost-effective solution to repair damaged or worn crankshafts without removing them from the engine.

This advanced service not only eliminates the need for engine disassembly and costly transportation but also significantly reduces downtime. Using state-of-the-art portable grinding equipment, our expert technicians restore the crankshaft’s dimensions and surface finish to OEM standards, ensuring optimum engine performance.

Wartsila VASA Engine Model 12V32LN Grinding Under Process	Crankpin Inspection Under Progress Before Polishing

With over four decades of experience, we’ve successfully delivered onsite crankshaft grinding services across the globe—including Burkina Faso, Bangladesh, Dubai, Indonesia, Singapore, and many other ports and shipyards worldwide. No matter where your vessel or power plant is located, RA Power Solutions is ready to respond with precision, speed, and expertise.

Get in touch with us today for expert services in onsite crankshaft repair, crankpin polishing, crankshaft reconditioning, and in-situ crankshaft grinding. Our team is equipped to provide fast and reliable solutions, wherever your engine is located. For inquiries or service requests, please email us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 / +91 9810012383. We’re here to support you—anytime, anywhere.

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The crankshaft and Main Journal details are as follows:

​Inspection Conducted by RA Power Solutions of Crankshaft of MAN B&W 18V23L-V0

i) On the Visual Inspection of the crankpin and main journal of the crankshaft, the damage of bearing was clearly seen; in fact, the bearing material was also found in the oil sump.

It was decided to remove the crankshaft from the engine block in order to thoroughly inspect crankpin and main journal diameter of the crankshaft. The main journal housing also required thorough inspection for any cracks, deviation in the main journal housing bore, and the alignment of the housing.

ii) The crankshaft was placed on the “V” block, the design of which was made by our technicians.

iii) The inspection in detail was conducted, including dimensional inspection report, MPI test for crack detection, Hardness test etc.

iv) While all the major parameters were observed within the limit. The crankpin Number #05, having a standard diameter of 185.00 and Main Journal Number #10, having a standard diameter of 220.00 MM, had excessive ovality, The deep line marks were also observed.

Action Taken by RA Power Solutions to Repair the Crankshaft of MAN B&W 18V23L-V0

i) The crankpin grinding was executed, the standard diameter of 185.00 was reduced by 1.5 MM, and the final diameter of 183.50 MM was maintained.

ii) The main journal diameter of 220.00 MM was reduced by 1.00 MM after grinding, and the final diameter was maintained as 219.00 MM.

iii) All the tolerance, surface finish, etc, were maintained strictly as per the manufacturer’s specifications stipulated in the manual.

We have been regularly executing on site crankshaft repairs and In Situ crankshaft grinding in Dubai, Fujairah, Qatar, Saudi Arabia, Oman, Iraq, Togo, Malta, Freetown, Egypt, Malaysia, Iran, Indonesia, Vietnam, Jordan, etc.

We have a team of trained technicians available 24/7 hrs and can be deputed in short notice. Some of our technicians also have a valid US VISA and can fly to South America, Caribbean countries, etc.

For more information regarding crankshaft grinding services, please contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

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Yanmar 6N18AL-UV crankshaft has a small diameter of 145.00 MM and a bearing width of only 64.00 MM, which requires a specially designed onsite crankshaft grinding machine. RA Power Solutions as a Manufacturer of onsite crankshaft grinding machines deputed two (2) technicians with the on site crankshaft grinding equipment and measuring instruments to repair the crankshaft.

Following are the Major Observations of the Damaged Crankshaft of Yanmar 6N18AL-UV

1. The crankpin number #02 was badly damaged due to the seizure of the bearing, the ovality more than 0.39 was observed. This crankpin due to seizure also had deep line marks.
2. All other parameters like hardness were observed within limits, and no cracks were found in the MPI test. The remaining Five (5) crankpins were also inspected and ovality up to 0.09 MM was observed.

Action Taken By RA Power Solutions to Repair the Yanmar 6N18AL-UV Crankshaft

1. Crankpin number #02 was ground to the third (3rd) undersize of 143.40 mm, thus reducing the diameter of the crankpin by 1.60 MM.
2. All other crankpins were polished by our specialized onsite crankshaft grinding and polishing equipment to remove the rough surface, line marks, etc.

Supply of Undersize Crankpin Bearings

RA Power Solutions technicians carried with them two (2) pairs each of 1.20 MM, 1.60 MM and 2.00 MM bearings. This helped the ship staff to assemble the engine immediately after grinding, they used 1.60 MM undersize crankpin bearings.

This facilitated them to immediately operate the Auxiliary Engine after crankshaft repair onsite was executed by RA Power Solutions technicians.

Stock of Yanmar 6N18AL-UV Standard and Undersize Crankpin and Main Journal Bearings

RA Power Solutions with 44 years of experience is very well aware of the difficulty faced by clients in getting the undersized crankpin bearings. We maintain the stock of crankpin bearings up to the undersize of 2.80 MM and have saved a number of crankshafts from rejection.

We have a team of trained technicians available 24/7 hrs and can be deputed on short notice. Some of our technicians also have valid US VISA and can fly to South America, Caribbean countries, etc.

For more information regarding crankshaft grinding services, please contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

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RA Power Solutions was approached and deputed our two technicians along with onsite crankshaft grinding equipment. The vessel was anchored at MIP Mersin, Turkey.

Following are the major Engine and Crankpin details:

HIMSEN HYUNDAI 6H 17/28 CR Pin Having Hairline Crack

Main Observations of Crankshaft of HIMSEN HYUNDAI 6H 17/28

i) On visual inspection, it was found that it was a case of lubricating oil pump failure, damaging the bearings of all connecting rods.

ii) The bearing material was found embedded on all six (6) crankpins and was carefully removed. After polishing the crankpins, the dimensional inspection was conducted. The taper, ovality ranging from 0.22 MM to 0.86 was observed.

CR Pin Hardness Inspection	CR Pin of HIMSEN HYUNDAI 6H 17/28 Before Repair

The Dimensional Inspection Report of Six (6) Number Crankpins of HIMSEN HYUNDAI 6H 17/28:

iii) The hardness was checked and was found within limits, except for a few spots, which were found not harmful to the crankshaft.

iv) The crankpins were subject to a MPI test for crack detection and minor hairline cracks were observed, All other parameters were found within the limit.

Crank Pin Before Repair	HIMSEN HYUNDAI 6H 17/28 After Grinding And Polishing

Action Taken By RA Power Solutions Technicians For Damaged Crankpins:

i) The grinding of all six (6) crankpins was undertaken by our insitu crankshaft grinding machine.

ii) Three (3) number of crankpins diameter was reduced by 1.00 MM and the final size was maintained as 174.00 MM.

iii) Three (3) number of crankpins diameter was reduced by 1.50 MM and the final size was maintained at 173.50 MM.

Final Report After Grinding is Pasted Below:

The tolerance of all six (6) number crankpins was maintained with 0.02 MM.

We have been regularly executing on site crankshaft repairs and In Situ crankshaft grinding in Dubai, Fujairah, Qatar, Saudi Arabia, Oman, Iraq, Togo, Malta, Freetown, Egypt, Malaysia, Iran, Indonesia, Vietnam, Jordan, etc.

We have a team of trained technicians available 24/7 and can be deputed at short notice. Some of our technicians also have valid US VISA and can fly to South America, Caribbean countries, etc.

For more information regarding crankshaft grinding services, onsite insitu crankshaft repair, crankshaft grinding and repair, grinding of onsite crankshaft repair, insitu crankshaft grinding repair, grinding of crankshaft onsite please contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131 or +91 9810012383.

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We have trained, qualified, and experienced technicians to undertake crankshaft inspection & to execute the crankshaft repair successfully after Pre-inspection is conducted.

Following services for crankshaft inspection on site & crankshaft repair are offered

• Inspection services for damaged crankshaft onsite or on board a vessel.
• In case of damaged crankshaft, we depute our experienced technicians to undertake inspections all over the world for land-based Diesel engines or main & auxiliary engines installed on the vessel.
• Technicians travel to the site in the minimum possible time as all our technicians have the necessary certificates & CDC which facilitates them to fly to any destination all over the world.
• Technicians carry with them calibrated latest breed of instruments to conduct the crankshaft inspection and crankshaft repair on site.

The crankshaft inspection includes the following

• Visual inspection of radius fillet, lubricating oil hole, counterweight, and complete crankshaft for any damage.
• Dimensional inspection of crankpin and main journal (in case possible) to check taper & ovality.
• Hardness test.
• Crack detection by MPI with the latest model of high-intensity magnaflux torch.
• In certain cases, a dye penetrant test is also undertaken.
• Surface roughness test by the latest model of the Mitutoyo surface testing instrument.
• Computerized reports are prepared in RA Power technical format and are submitted to the client.
• In case required RA Power Solutions can immediately depute a team of technicians with an onsite crankshaft/ cylindrical shaft grinding machine to execute the repair as per the International standards & specifications.

Inspection of the Crankshaft of the MAN Engine for purchase/ Replacement

The shipbreaking yard of Alang based in western India is coming up as the largest shipbreaking yard in the world. We offer crankshaft inspection services in case any of our clients want to purchase a used crankshaft or any major components like the engine block, connecting rod, cylinder head, turbocharger, etc. We also have the facility to undertake in-house reconditioning of the major parts removed from the engine.

Inspection of the crankshaft of the MAN Engine during routine maintenance

We strongly recommend inspection of the crankshaft during the routine maintenance of marine engines, and engines in operation in industries. The cost of on site inspection is negligible in comparison to the cost of a new crankshaft which needs replacement in case of damage. During the maintenance period, our technicians visit the installation and inspect the crankshaft in detail. We have the latest design of portable polishing & grinding machines available up to 700 mm diameter so that timely necessary corrective action can be undertaken.

We also conduct on site inspections of the following parts

• Turbine shaft
• Alternator shaft
• Rotor shaft
• Pump shaft
• Gear Box shaft

We have been regularly executing the inspection and repairs in Madagascar, Oman, Qatar, Philippines, Bahrain, Srilanka, Bangladesh, Myanmar, Turkey, Nigeria, Greece, Saudi Arabia, UK, Dubai, Malta, Cyprus, Singapore, Malaysia, Colombia, Indonesia, Hong Kong, Spain, Netherlands, Dubai, Portugal, Estonia, Morocco, Belgium, Vietnam, Canada, Jordan, Libya, Kuwait, Egypt, Morocco, Yemen, Bahrain, Tunisia, Sudan, Oman, Algeria, Saudi Arabia, Iraq, UAE, etc.

For more information about crankshaft inspection on site, inspection of Crankshaft of MAN Engine, please email us at rajshahani@rapowersolutions.com, or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.

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